The combustion of propane (C3H8)produces CO2 and H20: C3H8(g)+5O2(g) 3CO2(g)+4H2O(g) Calculate the mass, in grams, of H2O that will be produced if 2.5 mol of O2 is consumed.

1 answer

follow steps 3 and 4:
http://www.jiskha.com/science/chemistry/stoichiometry.html